Optical imaging lens

ABSTRACT

An optical imaging lens may include a first, a second, a third, a fourth, a fifth, a sixth, a seventh, and an eighth lens elements positioned in an order from an object side to an image side. Through designing concave and/or convex surfaces of each lens elements, the optical imaging lens may provide improved imaging quality and optical characteristics, reduced length of the optical imaging lens and increased field of view while the optical imaging lens may satisfy HFOV/TTL≥8.500°/mm, wherein a half field of view of the optical imaging lens is represented by HFOV, and the system length of the optical imaging lens is represented by TTL.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to P.R.C. Patent Application No.202010571479.X titled “Optical Imaging Lens,” filed on Jun. 22, 2020,with the State Intellectual Property Office of the People's Republic ofChina (SIPO).

TECHNICAL FIELD

The present disclosure relates to an optical imaging lens, andparticularly, to an optical imaging lens having at least eight lenselements.

BACKGROUND

Recently, optical imaging lenses continue to evolve. In addition torequiring the lens to be thin and short, it is also increasinglyimportant to improve the image quality of the lens such as aberrationand chromatic aberration. However, in response to demand, increasing thenumber of optical lenses will increase the distance from the object-sidesurface of the first lens to the image plane on the optical axis, whichis disadvantageous to the thinning of mobile phones and digital cameras.Therefore, it has always been the development goal of design to providean optical imaging lens that is light, thin, and short and has goodimaging quality. In addition, a large field of view has gradually becomea market trend. How to design an optical imaging lens with a large fieldof view in addition to pursuing a light, thin and short lens is also thefocus of research and development.

SUMMARY

In view of the above-mentioned problems, in addition to the good imagingquality of the optical imaging lens, shortening the length of the lensand expanding the angle of the field of view are the key points ofimprovement of the present invention.

The present disclosure provides an optical imaging lens for capturingimages and videos such as the optical imaging lens of cell phones,cameras, tablets, and personal digital assistants. By controlling theconvex or concave shape of the surfaces of at least eight lens elements,the length of the optical imaging lens may be shortened, and the fieldof view may be enlarged while maintaining good optical characteristics.

In the specification, parameters used herein may include:

Parameter Definition T1 A thickness of the first lens element along theoptical axis G12 A distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis, i.e., an air gap between the first lens element andthe second lens element along the optical axis T2 A thickness of thesecond lens element along the optical axis G23 A distance from theimage-side surface of the second lens element to the object- sidesurface of the third lens element along the optical axis, i.e., an airgap between the second lens element and the third lens element along theoptical axis T3 A thickness of the third lens element along the opticalaxis G34 A distance from the image-side surface of the third lenselement to the object-side surface of the fourth lens element along theoptical axis, i.e., an air gap between the third lens element and thefourth lens element along the optical axis T4 A thickness of the fourthlens element along the optical axis G45 A distance from the image-sidesurface of the fourth lens element to the object- side surface of thefifth lens element along the optical axis, i.e., an air gap between thefourth lens element and the fifth lens element along the optical axis T5A thickness of the fifth lens element along the optical axis G56 Adistance from the image-side surface of the fifth lens element to theobject-side surface of the sixth lens element along the optical axis,i.e., an air gap between the fifth lens element and the sixth lenselement along the optical axis T6 A thickness of the sixth lens elementalong the optical axis G67 A distance from the image-side surface of thesixth lens element to the object-side surface of the seventh lenselement along the optical axis, i.e., an air gap between the sixth lenselement and the seventh lens element along the optical axis T7 Athickness of the seventh lens element along the optical axis G78 Adistance from the image-side surface of the seventh lens element to theobject- side surface of the eighth lens element along the optical axisG79 A distance from the image-side surface of the seventh lens elementto the object- side surface of the ninth lens element along the opticalaxis, i.e., an air gap between the seventh lens element and the ninthlens element along the optical axis T9 A thickness of the ninth lenselement along the optical axis G98 A distance from the image-sidesurface of the ninth lens element to the object- side surface of theeighth lens element along the optical axis, i.e., an air gap between theninth lens element and the eighth lens element along the optical axis T8A thickness of the eighth lens element along the optical axis G8F Adistance from the image-side surface of the eighth lens element to theobject- side surface of the filtering unit along the optical axis, i.e.,an air gap between the eighth lens element and the filtering unit alongthe optical axis TTF A thickness of the filtering unit along the opticalaxis GFP A distance from the image-side surface of the filtering unit tothe image plane along the optical axis, i.e., an air gap between thefiltering unit and the image plane along the optical axis f1 A focallength of the first lens element f2 A focal length of the second lenselement f3 A focal length of the third lens element f4 A focal length ofthe fourth lens element f5 A focal length of the fifth lens element f6 Afocal length of the sixth lens element f7 A focal length of the seventhlens element f8 A focal length of the eighth lens element f9 A focallength of the ninth lens element n1 A refractive index of the first lenselement n2 A refractive index of the second lens element n3 A refractiveindex of the third lens element n4 A refractive index of the fourth lenselement n5 A refractive index of the fifth lens element n6 A refractiveindex of the sixth lens element n7 A refractive index of the seventhlens element n8 A refractive index of the eighth lens element n9 Arefractive index of the ninth lens element V1 An Abbe number of thefirst lens element V2 An Abbe number of the second lens element V3 AnAbbe number of the third lens element V4 An Abbe number of the fourthlens element V5 An Abbe number of the fifth lens element V6 An Abbenumber of the sixth lens element V7 An Abbe number of the seventh lenselement V8 An Abbe number of the eighth lens element V9 An Abbe numberof the ninth lens element HFOV Half Field of View of the optical imaginglens Fno F-number of the optical imaging lens EFL An effective focallength of the optical imaging lens TTL A distance from the object-sidesurface of the first lens element to the image plane along the opticalaxis, i.e., the system length of the optical imaging lens ALT A sum ofthe thicknesses of the first lens element, the second lens element, thethird lens element, the fourth lens element, the fifth lens element, thesixth lens element, the seventh lens element, and the eighth lenselement along the optical axis AAG A sum of a distance from theimage-side surface of the first lens element to the object-side surfaceof the second lens element along the optical axis, a distance from theimage-side surface of the second lens element to the object-side surfaceof the third lens element along the optical axis, a distance from theimage-side surface of the third lens element to the object-side surfaceof the fourth lens element along the optical axis, a distance from theimage-side surface of the fourth lens element to the object-side surfaceof the fifth lens element along the optical axis, a distance from theimage-side surface of the fifth lens element to the object-side surfaceof the sixth lens element along the optical axis, a distance from theimage-side surface of the sixth lens element to the object-side surfaceof the seventh lens element along the optical axis, and a distance fromthe image- side surface of the seventh lens element to the object-sidesurface of the eighth lens element along the optical axis BFL A backfocal length of the optical imaging lens, i.e., a distance from theimage- side surface of the eighth lens element to the image plane alongthe optical axis (i.e. a sum of G8F, TTF, and GFP) TL A distance fromthe object-side surface of the first lens element to the image-sidesurface of the eighth lens element along the optical axis ImgH An imageheight of the optical imaging lens

According to one embodiment of the optical imaging lens of the presentdisclosure, an optical imaging lens may comprise a first lens element, asecond lens element, a third lens element, a fourth lens element, afifth lens element, a sixth lens element, a seventh lens element, and aneighth lens element sequentially from an object side to an image sidealong an optical axis. The first lens element to the eighth lens elementmay each comprise an object-side surface facing toward the object sideand allowing imaging rays to pass through and an image-side surfacefacing toward the image side and allowing the imaging rays to passthrough. The first lens element may be arranged to be a lens element ina first order from the object side to the image side. The second lenselement may be arranged to be a lens element in a second order from theobject side to the image side and have negative refracting power. Thethird lens element may be arranged to be a lens element in a third orderfrom the object side to the image side. The fourth lens element may bearranged to be a lens element in a fourth order from the object side tothe image side and have negative refracting power. An optical axisregion of the object-side surface of the fourth lens element may beconcave. The fifth lens element may be arranged to be a lens element ina fifth order from the object side to the image side. The sixth lenselement may be arranged to be a lens element in a sixth order from theobject side to the image side. The seventh lens element may be arrangedto be a lens element in a seventh order from the object side to theimage side and have negative refracting power. The eighth lens elementmay be arranged to be a lens element in a first order from the imageside to the object side. An optical axis region of the object-sidesurface of the eighth lens element may be concave. The optical imaginglens may satisfy Inequality (1): HFOV/TTL≥8.500°/mm.

According to another embodiment of the optical imaging lens of thepresent disclosure, an optical imaging lens may comprise a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement, and an eighth lens element sequentially from an object side toan image side along an optical axis. The first lens element to theeighth lens element may each comprise an object-side surface facingtoward the object side and allowing imaging rays to pass through and animage-side surface facing toward the image side and allowing the imagingrays to pass through. The first lens element may be arranged to be alens element in a first order from the object side to the image side.The second lens element may be arranged to be a lens element in a secondorder from the object side to the image side. The third lens element maybe arranged to be a lens element in a third order from the object sideto the image side. The fourth lens element may be arranged to be a lenselement in a fourth order from the object side to the image side andhave negative refracting power. An optical axis region of theobject-side surface of the fourth lens element may be concave. The fifthlens element may be arranged to be a lens element in a fifth order fromthe object side to the image side. A periphery region of the object-sidesurface of the fifth lens element may be concave. The sixth lens elementmay be arranged to be a lens element in a sixth order from the objectside to the image side. The seventh lens element may be arranged to be alens element in a seventh order from the object side to the image sideand have negative refracting power. The eighth lens element may bearranged to be a lens element in a first order from the image side tothe object side. An optical axis region of the object-side surface ofthe eighth lens element may be concave. The optical imaging lens maysatisfy Inequality (1): HFOV/TTL≥8.500°/mm.

According to another embodiment of the optical imaging lens of thepresent disclosure, an optical imaging lens may comprise a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement, and an eighth lens element sequentially from an object side toan image side along an optical axis. The first lens element to theeighth lens element may each comprise an object-side surface facingtoward the object side and allowing imaging rays to pass through and animage-side surface facing toward the image side and allowing the imagingrays to pass through. The first lens element may be arranged to be alens element in a first order from the object side to the image side. Aperiphery region of the image-side surface of the first lens element maybe convex. The second lens element may be arranged to be a lens elementin a second order from the object side to the image side. The third lenselement may be arranged to be a lens element in a third order from theobject side to the image side. The fourth lens element may be arrangedto be a lens element in a fourth order from the object side to the imageside. The fifth lens element may be arranged to be a lens element in afifth order from the object side to the image side. The sixth lenselement may be arranged to be a lens element in a sixth order from theobject side to the image side. The seventh lens element may be arrangedto be a lens element in a seventh order from the object side to theimage side and have negative refracting power. The eighth lens elementmay be arranged to be a lens element in a first order from the imageside to the object side. An optical axis region of the object-sidesurface of the eighth lens element may be concave. The optical imaginglens may satisfy Inequality (1): HFOV/TTL≥8.500°/mm.

In another exemplary embodiment, some Inequalities could be taken intoconsideration as follows:

TTL/(T6+G67+T7+G78)≤4.500  Inequality (2);

(T6+T7)/T5≥3.600  Inequality (3);

(T2+G23+T3)/T4≥4.200  Inequality (4);

(T7+G78+T8)/T1≤3.500  Inequality (5);

(G45+T5+T6)/T2≤5.300  Inequality (6);

EFL/(G12+T2+T3)≤4.700  Inequality (7);

ALT/(T1+G34+G56)≥3.200  Inequality (8);

AAG/(G67+G78)≤3.700  Inequality (9);

TL/(T3+G34+T6)≤3.600  Inequality (10);

TTL/(G78+T8+BFL)≤3.800  Inequality (11);

EFL/(T1+T4+T5)≥3.600  Inequality (12);

(T3+G34)/T5≥2.600  Inequality (13);

(T1+G23)/T4≤4.300  Inequality (14);

(T1+AAG)/T3≤3.800  Inequality (15);

(G12+G78)/T2≤2.900  Inequality (16);

AAG/T8≤6.600  Inequality (17); and

(T3+T4+T5)/T8≥3.600  Inequality (18).

Any one of the aforementioned inequalities may be selectivelyincorporated in other inequalities to apply to the present embodiments,and as such are not limiting. In some example embodiments, more detailsabout the convex or concave surface structure, refracting power orchosen material etc. could be incorporated for one specific lens elementor broadly for plural lens elements to enhance the control for thesystem performance and/or resolution. It is noted that the detailslisted here could be incorporated in example embodiments if noinconsistency occurs.

According to above illustration, the length of the optical imaging lensmay be shortened, and the field of view may be enlarged whilemaintaining good optical characteristics by controlling the convex orconcave shape of the surfaces of lens elements.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appendeddrawings, in which:

FIG. 1 depicts a cross-sectional view of one single lens elementaccording to one embodiment of the present disclosure;

FIG. 2 depicts a schematic view of a relation between a surface shapeand an optical focus of a lens element;

FIG. 3 depicts a schematic view of a first example of a surface shapeand an effective radius of a lens element;

FIG. 4 depicts a schematic view of a second example of a surface shapeand an effective radius of a lens element;

FIG. 5 depicts a schematic view of a third example of a surface shapeand an effective radius of a lens element;

FIG. 6 depicts a cross-sectional view of an embodiment of an opticalimaging lens according to the first embodiment of the presentdisclosure;

FIG. 7 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the first embodiment of an opticalimaging lens according to the present disclosure;

FIG. 8 depicts a table of optical data for each lens element of anoptical imaging lens of the first embodiment of the present disclosure;

FIG. 9 depicts a table of aspherical data of the first embodiment of anoptical imaging lens according to the present disclosure;

FIG. 10 depicts a cross-sectional view of the second embodiment of anoptical imaging lens according to the present disclosure;

FIG. 11 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the second embodiment of an opticalimaging lens according to the present disclosure;

FIG. 12 depicts a table of optical data for each lens element of anoptical imaging lens of the second embodiment of the present disclosure;

FIG. 13 depicts a table of aspherical data of the second embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 14 depicts a cross-sectional view of the third embodiment of anoptical imaging lens according to the present disclosure;

FIG. 15 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the third embodiment of an opticalimaging lens according to the present disclosure;

FIG. 16 depicts a table of optical data for each lens element of theoptical imaging lens of the third embodiment of the present disclosure;

FIG. 17 depicts a table of aspherical data of the third embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 18 depicts a cross-sectional view of the fourth embodiment of anoptical imaging lens according to the present disclosure;

FIG. 19 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the fourth embodiment of an opticalimaging lens according to the present disclosure;

FIG. 20 depicts a table of optical data for each lens element of anoptical imaging lens of the fourth embodiment of the present disclosure;

FIG. 21 depicts a table of aspherical data of the fourth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 22 depicts a cross-sectional view of the fifth embodiment of anoptical imaging lens according to the present disclosure;

FIG. 23 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the fifth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 24 depicts a table of optical data for each lens element of theoptical imaging lens of the fifth embodiment of the present disclosure;

FIG. 25 depicts a table of aspherical data of the fifth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 26 depicts a cross-sectional view of the sixth embodiment of anoptical imaging lens according to the present disclosure;

FIG. 27 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the sixth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 28 depicts a table of optical data for each lens element of thesixth embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 29 depicts a table of aspherical data of the sixth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 30 depicts a cross-sectional view of the seventh embodiment of anoptical imaging lens according to the present disclosure;

FIG. 31 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the seventh embodiment of the opticalimaging lens according to the present disclosure;

FIG. 32 depicts a table of optical data for each lens element of theseventh embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 33 depicts a table of aspherical data of the seventh embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 34 depicts a cross-sectional view of the eighth embodiment of anoptical imaging lens according to the present disclosure;

FIG. 35 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the eighth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 36 depicts a table of optical data for each lens element of theeighth embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 37 depicts a table of aspherical data of the eighth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 38 depicts a cross-sectional view of the ninth embodiment of anoptical imaging lens according to the present disclosure;

FIG. 39 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the ninth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 40 depicts a table of optical data for each lens element of theninth embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 41 depicts a table of aspherical data of the ninth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 42 depicts a cross-sectional view of the tenth embodiment of anoptical imaging lens according to the present disclosure;

FIG. 43 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the tenth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 44 depicts a table of optical data for each lens element of thetenth embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 45 depicts a table of aspherical data of the tenth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 46 depicts a cross-sectional view of the eleventh embodiment of anoptical imaging lens according to the present disclosure;

FIG. 47 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the eleventh embodiment of the opticalimaging lens according to the present disclosure;

FIG. 48 depicts a table of optical data for each lens element of theeleventh embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 49 depicts a table of aspherical data of the eleventh embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 50 depicts a cross-sectional view of the twelfth embodiment of anoptical imaging lens according to the present disclosure;

FIG. 51 depicts a chart of a longitudinal spherical aberration and otherkinds of optical aberrations of the twelfth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 52 depicts a table of optical data for each lens element of thetwelfth embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 53 depicts a table of aspherical data of the twelfth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 54A and FIG. 54B are tables for the values of T1, G12, T2, G23, T3,G34, T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TTF, GFP, BFL, EFL,TTL, TL, ALT, AAG, HFOV, HFOV/TTL, TTL/(T6+G67+T7+G78), (T6+T7)/T5,(T2+G23+T3)/T4, (T7+G78+T8)/T1, (G45+T5+T6)/T2, EFL/(G12+T2+T3),ALT/(T1+G34+G56), AAG/(G67+G78), TL/(T3+G34+T6), TTL/(G78+T8+BFL),EFL/(T1+T4+T5), (T3+G34)/T5, (T1+G23)/T4, (T1+AAG)/T3, (G12+G78)/T2,AAG/T8, and (T3+T4+T5)/T8 as determined in specific example embodiments.

DETAILED DESCRIPTION

The terms “optical axis region”, “periphery region”, “concave”, and“convex” used in this specification and claims should be interpretedbased on the definition listed in the specification by the principle oflexicographer.

In the present disclosure, the optical system may comprise at least onelens element to receive imaging rays that are incident on the opticalsystem over a set of angles ranging from parallel to an optical axis toa half field of view (HFOV) angle with respect to the optical axis. Theimaging rays pass through the optical system to produce an image on animage plane. The term “a lens element having positive refracting power(or negative refracting power)” means that the paraxial refracting powerof the lens element in Gaussian optics is positive (or negative). Theterm “an object-side (or image-side) surface of a lens element” refersto a specific region of that surface of the lens element at whichimaging rays can pass through that specific region. Imaging rays includeat least two types of rays: a chief ray Lc and a marginal ray Lm (asshown in FIG. 1). An object-side (or image-side) surface of a lenselement can be characterized as having several regions, including anoptical axis region, a periphery region, and, in some cases, one or moreintermediate regions, as discussed more fully below.

FIG. 1 is a radial cross-sectional view of a lens element 100. Tworeferential points for the surfaces of the lens element 100 can bedefined: a central point, and a transition point. The central point of asurface of a lens element is a point of intersection of that surface andthe optical axis I. As illustrated in FIG. 1, a first central point CP1may be present on the object-side surface 110 of lens element 100 and asecond central point CP2 may be present on the image-side surface 120 ofthe lens element 100. The transition point is a point on a surface of alens element, at which the line tangent to that point is perpendicularto the optical axis I. The optical boundary OB of a surface of the lenselement is defined as a point at which the radially outermost marginalray Lm passing through the surface of the lens element intersects thesurface of the lens element. All transition points lie between theoptical axis I and the optical boundary OB of the surface of the lenselement. If multiple transition points are present on a single surface,then these transition points are sequentially named along the radialdirection of the surface with reference numerals starting from the firsttransition point. For example, the first transition point, e.g., TP1,(closest to the optical axis I), the second transition point, e.g., TP2,(as shown in FIG. 4), and the Nth transition point (farthest from theoptical axis I).

The region of a surface of the lens element from the central point tothe first transition point TP1 is defined as the optical axis region,which includes the central point. The region located radially outside ofthe farthest Nth transition point from the optical axis I to the opticalboundary OB of the surface of the lens element is defined as theperiphery region. In some embodiments, there may be intermediate regionspresent between the optical axis region and the periphery region, withthe number of intermediate regions depending on the number of thetransition points.

The shape of a region is convex if a collimated ray being parallel tothe optical axis I and passing through the region is bent toward theoptical axis I such that the ray intersects the optical axis Ion theimage side A2 of the lens element. The shape of a region is concave ifthe extension line of a collimated ray being parallel to the opticalaxis I and passing through the region intersects the optical axis I onthe object side A1 of the lens element.

Additionally, referring to FIG. 1, the lens element 100 may also have amounting portion 130 extending radially outward from the opticalboundary OB. The mounting portion 130 is typically used to physicallysecure the lens element to a corresponding element of the optical system(not shown). Imaging rays do not reach the mounting portion 130. Thestructure and shape of the mounting portion 130 are only examples toexplain the technologies, and should not be taken as limiting the scopeof the present disclosure. The mounting portion 130 of the lens elementsdiscussed below may be partially or completely omitted in the followingdrawings.

Referring to FIG. 2, optical axis region Z1 is defined between centralpoint CP and first transition point TP1. Periphery region Z2 is definedbetween TP1 and the optical boundary OB of the surface of the lenselement. Collimated ray 211 intersects the optical axis I on the imageside A2 of lens element 200 after passing through optical axis regionZ1, i.e., the focal point of collimated ray 211 after passing throughoptical axis region Z1 is on the image side A2 of the lens element 200at point R in FIG. 2. Accordingly, since the ray itself intersects theoptical axis I on the image side A2 of the lens element 200, opticalaxis region Z1 is convex. On the contrary, collimated ray 212 divergesafter passing through periphery region Z2. The extension line EL ofcollimated ray 212 after passing through periphery region Z2 intersectsthe optical axis I on the object side A1 of lens element 200, i.e., thefocal point of collimated ray 212 after passing through periphery regionZ2 is on the object side A1 at point M in FIG. 2. Accordingly, since theextension line EL of the ray intersects the optical axis I on the objectside A1 of the lens element 200, periphery region Z2 is concave. In thelens element 200 illustrated in FIG. 2, the first transition point TP1is the border of the optical axis region and the periphery region, i.e.,TP1 is the point at which the shape changes from convex to concave.

Alternatively, there is another way for a person having ordinary skillin the art to determine whether an optical axis region is convex orconcave by referring to the sign of “Radius” (the “R” value), which isthe paraxial radius of shape of a lens surface in the optical axisregion. The R value is commonly used in conventional optical designsoftware such as Zemax and CodeV. The R value usually appears in thelens data sheet in the software. For an object-side surface, a positiveR value defines that the optical axis region of the object-side surfaceis convex, and a negative R value defines that the optical axis regionof the object-side surface is concave. Conversely, for an image-sidesurface, a positive R value defines that the optical axis region of theimage-side surface is concave, and a negative R value defines that theoptical axis region of the image-side surface is convex. The resultfound by using this method should be consistent with the methodutilizing intersection of the optical axis by rays/extension linesmentioned above, which determines surface shape by referring to whetherthe focal point of a collimated ray being parallel to the optical axis Iis on the object-side or the image-side of a lens element. As usedherein, the terms “a shape of a region is convex (concave),” “a regionis convex (concave),” and “a convex-(concave-) region,” can be usedalternatively.

FIG. 3, FIG. 4 and FIG. 5 illustrate examples of determining the shapeof lens element regions and the boundaries of regions under variouscircumstances, including the optical axis region, the periphery region,and intermediate regions as set forth in the present specification.

FIG. 3 is a radial cross-sectional view of a lens element 300. Asillustrated in FIG. 3, only one transition point TP1 appears within theoptical boundary OB of the image-side surface 320 of the lens element300. Optical axis region Z1 and periphery region Z2 of the image-sidesurface 320 of lens element 300 are illustrated. The R value of theimage-side surface 320 is positive (i.e., R>0). Accordingly, the opticalaxis region Z1 is concave.

In general, the shape of each region demarcated by the transition pointwill have an opposite shape to the shape of the adjacent region(s).Accordingly, the transition point will define a transition in shape,changing from concave to convex at the transition point or changing fromconvex to concave. In FIG. 3, since the shape of the optical axis regionZ1 is concave, the shape of the periphery region Z2 will be convex asthe shape changes at the transition point TP1.

FIG. 4 is a radial cross-sectional view of a lens element 400. Referringto FIG. 4, a first transition point TP1 and a second transition pointTP2 are present on the object-side surface 410 of lens element 400. Theoptical axis region Z1 of the object-side surface 410 is defined betweenthe optical axis I and the first transition point TP1. The R value ofthe object-side surface 410 is positive (i.e., R>0). Accordingly, theoptical axis region Z1 is convex.

The periphery region Z2 of the object-side surface 410, which is alsoconvex, is defined between the second transition point TP2 and theoptical boundary OB of the object-side surface 410 of the lens element400. Further, intermediate region Z3 of the object-side surface 410,which is concave, is defined between the first transition point TP1 andthe second transition point TP2. Referring once again to FIG. 4, theobject-side surface 410 includes an optical axis region Z1 locatedbetween the optical axis I and the first transition point TP1, anintermediate region Z3 located between the first transition point TP1and the second transition point TP2, and a periphery region Z2 locatedbetween the second transition point TP2 and the optical boundary OB ofthe object-side surface 410. Since the shape of the optical axis regionZ1 is designed to be convex, the shape of the intermediate region Z3 isconcave as the shape of the intermediate region Z3 changes at the firsttransition point TP1, and the shape of the periphery region Z2 is convexas the shape of the periphery region Z2 changes at the second transitionpoint TP2.

FIG. 5 is a radial cross-sectional view of a lens element 500. Lenselement 500 has no transition point on the object-side surface 510 ofthe lens element 500. For a surface of a lens element with no transitionpoint, for example, the object-side surface 510 the lens element 500,the optical axis region Z1 is defined as the region between 0-50% of thedistance between the optical axis I and the optical boundary OB of thesurface of the lens element and the periphery region is defined as theregion between 50%-100% of the distance between the optical axis I andthe optical boundary OB of the surface of the lens element. Referring tolens element 500 illustrated in FIG. 5, the optical axis region Z1 ofthe object-side surface 510 is defined between the optical axis I and50% of the distance between the optical axis I and the optical boundaryOB. The R value of the object-side surface 510 is positive (i.e., R>0).Accordingly, the optical axis region Z1 is convex. For the object-sidesurface 510 of the lens element 500, because there is no transitionpoint, the periphery region Z2 of the object-side surface 510 is alsoconvex. It should be noted that lens element 500 may have a mountingportion (not shown) extending radially outward from the periphery regionZ2.

In the optical imaging lens of the present disclosure, at least eightlens elements may be arranged from an object side to an image side alongan optical axis, and comprise a first lens element, a second lenselement, a third lens element, a fourth lens element, a fifth lenselement, a sixth lens element, a seventh lens element, and an eighthlens element sequentially. The first lens element to the eighth lenselement may each comprise an object-side surface facing toward theobject side and allowing imaging rays to pass through and an image-sidesurface facing toward the image side and allowing the imaging rays topass through. The length of the optical imaging lens may be shortened,and the field of view may be enlarged while maintaining good imagingquality by designing the detailed features of the following lenselements.

According to some embodiments of the present invention, correcting thespherical aberration, aberration of the optical system, and decreasingthe distortion of the optical system can be effectively achieved throughthe concave-convex design of the following surface shape and thelimitation of the refracting power of lens elements: the second lenselement having negative refracting power, the fourth lens element havingnegative refracting power, an optical axis region of the object-sidesurface the fourth lens element being concave, the seventh lens elementhaving negative refracting power, and an optical axis region of theobject-side surface of the eighth lens element being concave. At thesame time, the field of view of the optical imaging lens can be extendedand the system length of the optical imaging lens can be reduced bydesigning the optical imaging lens to satisfy the inequality (1):HFOV/TTL≥8.500°/mm, and a preferable range may be8.500°/mm≤HFOV/TTL≤12.300°/mm.

According to some embodiments of the present invention, correcting thespherical aberration, aberration of the optical system, and decreasingthe distortion of the optical system can be effectively achieved throughthe concave-convex design of the following surface shape and thelimitation of the refracting power of lens elements: the fourth lenselement having negative refracting power, an optical axis region of theobject-side surface the fourth lens element being concave, a peripheryregion of the object-side surface of the fifth lens element beingconcave, the seventh lens element having negative refracting power, andan optical axis region of the object-side surface of the eighth lenselement being concave. At the same time, the field of view of theoptical imaging lens can be extended and the system length of theoptical imaging lens can be reduced by designing the optical imaginglens to satisfy the inequality (1): HFOV/TTL≥8.500°/mm, and a preferablerange may be 8.500°/mm≤HFOV/TTL≤12.300°/mm.

According to some embodiments of the present invention, correcting thespherical aberration, aberration of the optical system, and decreasingthe distortion of the optical system can be effectively achieved throughthe concave-convex design of the following surface shape and thelimitation of the refracting power of lens elements: a periphery regionof the image-side surface of the first lens element being convex, theseventh lens element having negative refracting power, and an opticalaxis region of the object-side surface of the eighth lens element beingconcave. At the same time, the field of view of the optical imaging lenscan be extended and the system length of the optical imaging lens can bereduced by designing the optical imaging lens to satisfy the inequality(1): HFOV/TTL≥8.500°/mm, and a preferable range may be8.500°/mm≤HFOV/TTL≤12.300°/mm.

According to some embodiments of the present invention, to achieve ashortened length of lens system while maintaining image quality, valuesof the air gap between lens elements or the thickness of each lenselement may be adjusted appropriately. In addition to inequality (1),the optical imaging lens may be also designed to selectively satisfyinequalities (2)-(18). To improve ease of manufacturing the opticalimaging lens, an optical imaging lens of the present disclosure may alsosatisfy one or more of the inequalities below:

2.800≤TTL/(T6+G67+T7+G78)≤4.500;

3.600≤(T6+T7)/T5≤5.200;

4.200≤(T2+G23+T3)/T4≤6.600;

1.500≤(T7+G78+T8)/T1≤3.500;

2.600≤(G45+T5+T6)/T2≤5.300;

2.800≤EFL/(G12+T2+T3)≤4.700;

3.200≤ALT/(T1+G34+G56)≤6.000;

1.700≤AAG/(G67+G78)≤3.700;

2.500≤TL/(T3+G34+T6)≤3.600;

2.900≤TTL/(G78+T8+BFL)≤3.800;

3.600≤EFL/(T1+T4+T5)≤4.300;

2.600≤(T3+G34)/T5≤4.500;

2.000≤(T1+G23)/T4≤4.300;

1.300≤(T1+AAG)/T3≤3.800;

0.800≤(G12+G78)/T2≤2.900;

2.000≤AAG/T8≤6.600; and

3.600≤(T3+T4+T5)/T8≤5.700.

In addition, any combination of the embodiment parameters can beselected to increase the limitation of the optical imaging lens, so asto facilitate the design of the optical imaging lens of the samearchitecture of the present invention. In light of the unpredictabilityin an optical system, in the present disclosure, satisfying theseinequalities listed above may result in promoting the imaging quality,shortening the system length, increasing the field of view and/orincreasing the yield in the assembly process.

Several exemplary embodiments and associated optical data will now beprovided to illustrate non-limiting examples of optical imaging lenssystems having good optical characteristics and an extended field ofview. Reference is now made to FIGS. 6-9. FIG. 6 illustrates an examplecross-sectional view of an optical imaging lens 1 according to a firstexample embodiment. FIG. 7 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 1 according to the first example embodiment. FIG. 8illustrates an example table of optical data of each lens element of theoptical imaging lens 1 according to the first example embodiment. FIG. 9depicts an example table of aspherical data of the optical imaging lens1 according to the first example embodiment.

As shown in FIG. 6, the optical imaging lens 1 of the present embodimentmay comprise, in order from an object side A1 to an image side A2 alongan optical axis, an aperture stop STO, a first lens element L1, a secondlens element L2, a third lens element L3, a fourth lens element L4, afifth lens element L5, a sixth lens element L6, a seventh lens elementL7 and an eighth lens element L8. A filtering unit TF and an image planeIMA of an image sensor (not shown) are positioned at the image side A2of the optical imaging lens 1. Each of the first, second, third, fourth,fifth, sixth, seventh and eighth lens elements L1, L2, L3, L4, L5, L6,L7, L8 and the filtering unit TF may comprise an object-side surfaceL1A1/L2A1/L3A1/L4A1/L5A1/L6A1/L7A1/L8A1/TFA1 facing toward the objectside A1 and an image-side surfaceL1A2/L2A2/L3A2/L4A2/L5A2/L6A2/L7A2/L8A2/TFA2 facing toward the imageside A2. The example embodiment of the filtering unit TF illustrated maybe an IR cut filter (infrared cut filter) positioned between the eighthlens element L8 and the image plane IMA. The filtering unit TFselectively absorbs light passing optical imaging lens 1 that has aspecific wavelength. For example, if IR light is absorbed, IR lightwhich may not be seen by human eyes may be prohibited from producing animage on the image plane IMA.

Exemplary embodiments of each lens element of the optical imaging lens 1will now be described with reference to the drawings. The lens elementsL1, L2, L3, L4, L5, L6, L7, L8 of the optical imaging lens 1 may beconstructed using plastic materials in this embodiment for the purposeof lightweight product.

An example embodiment of the first lens element L1 may be arranged to bea lens element in a first order from the object side A1 to the imageside A2 and have positive refracting power. The optical axis regionL1A1C and the periphery region L1A1P of the object-side surface L1A1 ofthe first lens element L1 may be convex. The optical axis region L1A2Cand the periphery region L1A2P of the image-side surface L1A2 of thefirst lens element L1 may be convex.

An example embodiment of the second lens element L2 may be arranged to alens element in a second order from the object side A1 to the image sideA2 and have negative refracting power. The optical axis region L2A1C andthe periphery region L2A1P of the object-side surface L2A1 of the secondlens element L2 may be convex. The optical axis region L2A2C and theperiphery region L2A2P of the image-side surface L2A2 of the second lenselement L2 may be concave.

An example embodiment of the third lens element L3 may be arranged to alens element in a third order from the object side A1 to the image sideA2 and have positive refracting power. The optical axis region L3A1C ofthe object-side surface L3A1 of the third lens element L3 may be convex.The periphery region L3A1P of the object-side surface L3A1 of the thirdlens element L3 may be concave. The optical axis region L3A2C and theperiphery region L3A2P of the image-side surface L3A2 of the third lenselement L3 may be convex.

An example embodiment of the fourth lens element L4 may be arranged tobe a lens element in a fourth order from the object side A1 to the imageside A2 and have negative refracting power. The optical axis regionL4A1C and the periphery region L4A1P of the object-side surface L4A1 ofthe fourth lens element L4 may be concave. The optical axis region L4A2Cand the periphery region L4A2P of the image-side surface L4A2 of thefourth lens element L4 may be convex.

An example embodiment of the fifth lens element L5 may be arranged to bea lens element in a fifth order from the object side A1 to the imageside A2 and have positive refracting power. The optical axis regionL5A1C and the periphery region L5A1P of the object-side surface L5A1 ofthe fifth lens element L5 may be concave. The optical axis region L5A2Cand the periphery region L5A2P of the image-side surface L5A2 of thefifth lens element L5 may be convex.

An example embodiment of the sixth lens element L6 may be arranged to bea lens element in a sixth order from the object side A1 to the imageside A2 and have positive refracting power. The optical axis regionL6A1C of the object-side surface L6A1 of the sixth lens element L6 maybe convex. The periphery region L6A1P of the object-side surface L6A1 ofthe sixth lens element L6 may be concave. The optical axis region L6A2Cand the periphery region L6A2P of the image-side surface L6A2 of thesixth lens element L6 may be convex.

An example embodiment of the seventh lens element L7 may be arranged tobe a lens element in a seventh order from the object side A1 to theimage side A2 and may have negative refracting power. The optical axisregion L7A1C of the object-side surface L7A1 of the seventh lens elementL7 may be convex. The periphery region L7A1P of the object-side surfaceL7A1 of the seventh lens element L7 may be concave. The optical axisregion L7A2C of the image-side surface L7A2 of the seventh lens elementL7 may be concave. The periphery region L7A2P of the image-side surfaceL7A2 of the seventh lens element L7 may be convex.

An example embodiment of the eighth lens element L8 may be arranged tobe a lens element in a first order from the image side A2 to the objectside A1 and have negative refracting power. The optical axis regionL8A1C and the periphery region L8A1P of the object-side surface L8A1 ofthe eighth lens element L8 may be concave. The optical axis region L8A2Cof the image-side surface L8A2 of the eight lens element L8 may beconcave. The periphery region L8A2P of the image-side surface L8A2 ofthe eighth lens element L8 may be convex.

The totaled 16 aspherical surfaces including the object-side surfaceL1A1 and the image-side surface L1A2 of the first lens element L1, theobject-side surface L2A1 and the image-side surface L2A2 of the secondlens element L2, the object-side surface L3A1 and the image-side surfaceL3A2 of the third lens element L3, the object-side surface L4A1 and theimage-side surface L4A2 of the fourth lens element L4, the object-sidesurface L5A1 and the image-side surface L5A2 of the fifth lens elementL5, the object-side surface L6A1 and the image-side surface L6A2 of thesixth lens element L6, the object-side surface L7A1 and the image-sidesurface L7A2 of the seventh lens element L7, and the object-side surfaceL8A1 and the image-side surface L8A2 of the eighth lens element L8 mayall be defined by the following aspherical formula (1):

$\begin{matrix}{{Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum_{i = 1}^{n}{a_{2i} \times Y^{2i}}}}} & {{formula}\mspace{14mu}(1)}\end{matrix}$

wherein,

Z represents the depth of the aspherical surface (the perpendiculardistance between the point of the aspherical surface at a distance Yfrom the optical axis and the tangent plane of the vertex on the opticalaxis of the aspherical surface);

R represents the radius of curvature of the surface of the lens element;

Y represents the perpendicular distance between the point of theaspherical surface and the optical axis;

K represents a conic constant; and

a_(2i) represents an aspherical coefficient of 2i^(th) level.

The values of each aspherical parameter are shown in FIG. 9.

FIG. 7(a) shows a longitudinal spherical aberration for threerepresentative wavelengths (470 nm, 555 nm, 650 nm), wherein thevertical axis of FIG. 7(a) defines the field of view. FIG. 7(b) showsthe field curvature aberration in the sagittal direction for threerepresentative wavelengths (470 nm, 555 nm, 650 nm), wherein thevertical axis of FIG. 7(b) defines the image height. FIG. 7(c) shows thefield curvature aberration in the tangential direction for threerepresentative wavelengths (470 nm, 555 nm, 650 nm), wherein thevertical axis of FIG. 7(c) defines the image height. FIG. 7(d) shows avariation of the distortion aberration, wherein the vertical axis ofFIG. 7(d) defines the image height. The three curves with differentwavelengths (470 nm, 555 nm, 650 nm) may represent that off-axis lightwith respect to these wavelengths may be focused around an image point.From the vertical deviation of each curve shown in FIG. 7(a), the offsetof the off-axis light relative to the image point may be within ±0.01mm. Therefore, the first embodiment may improve the longitudinalspherical aberration with respect to different wavelengths. Referring toFIG. 7(b), the focus variation with respect to the three differentwavelengths (470 nm, 555 nm, 650 nm) in the whole field may fall within±0.02 mm. Referring to FIG. 7(c), and the focus variation with respectto the three different wavelengths (470 nm, 555 nm, 650 nm) in the wholefield may fall within ±0.03 mm. Referring to FIG. 7(d), the horizontalaxis of FIG. 7(d), the variation of the distortion aberration may bewithin±4%.

As shown in FIG. 8, the distance from the object-side surface L1A1 ofthe first lens element L1 to the image plane IMA along the optical axis(TTL) may be 3.579 mm, Fno may be 2.000, HFOV may be 42.500 degrees, thesystem effective length (EFL) may be 2.408 mm, and the image height(ImgH) may be 2.236 mm. In conjunction with values of aberrations inFIG. 7, the present embodiment may provide an optical imaging lens 1having a shortened length and an extended field of view while improvingoptical performance.

Please refer to FIG. 54A for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TTF, GFP, BFL, EFL, TTL,TL, ALT, AAG, HFOV, HFOV/TTL, TTL/(T6+G67+T7+G78), (T6+T7)/T5,(T2+G23+T3)/T4, (T7+G78+T8)/T1, (G45+T5+T6)/T2, EFL/(G12+T2+T3),ALT/(T1+G34+G56), AAG/(G67+G78), TL/(T3+G34+T6), TTL/(G78+T8+BFL),EFL/(T1+T4+T5), (T3+G34)/T5, (T1+G23)/T4, (T1+AAG)/T3, (G12+G78)/T2,AAG/T8, and (T3+T4+T5)/T8 of the present embodiment.

Reference is now made to FIGS. 10-13. FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 2 according to a secondexample embodiment. FIG. 11 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 2 according to the second example embodiment. FIG.12 shows an example table of optical data of each lens element of theoptical imaging lens 2 according to the second example embodiment. FIG.13 shows an example table of aspherical data of the optical imaging lens2 according to the second example embodiment.

As shown in FIG. 10, the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the convex or concave surface structures, includingthe object-side surfaces L1A1, L3A1, L4A1, L5A1, L6A1, L7A1, and L8A1and the image-side surfaces L2A2, L3A2, L4A2, L5A2, L6A2, L7A2, and L8A2of the present embodiment may be generally similar to the opticalimaging lens 1, but the differences between the optical imaging lens 1and the optical imaging lens 2 may include a refracting power of thefifth lens element L5, the concave or convex surface structures of theimage-side surface L1A2 and the object-side surface L2A1. Additionaldifferences may include a radius of curvature, a thickness, asphericaldata, and/or an effective focal length of each lens element. Morespecifically, the fifth lens element L5 may have negative refractingpower, the optical axis region L1A2C of the image-side surface L1A2 ofthe first lens element L1 may be concave, and the peripheral regionL2A1P of the object-side surface L2A1 of the second lens element L2 maybe concave.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 12 for the opticalcharacteristics of each lens element in the optical imaging lens 2 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 11(a), theoffset of the off-axis light relative to the image point may bewithin±0.01 mm. Referring to FIG. 11(b), and the focus variation withrespect to the three different wavelengths (470 nm, 555 nm, 650 nm) inthe whole field may fall within±0.016 mm. Referring to FIG. 11(c), thefocus variation with respect to the three different wavelengths (470 nm,555 nm, 650 nm) in the whole field may fall within±0.02 mm. Referring toFIG. 11(d), the variation of the distortion aberration of the opticalimaging lens 2 may be within±8%.

As shown in FIG. 11 and FIG. 12, in comparison with the firstembodiment, the field curvature aberration in the sagittal direction,and the field curvature aberration in the tangential direction in thesecond embodiment may be smaller. Further, the second embodiment may beeasy to be manufactured and have better yield.

Please refer to FIG. 54A for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TTF, GFP, BFL, EFL, TTL,TL, ALT, AAG, HFOV, HFOV/TTL, TTL/(T6+G67+T7+G78), (T6+T7)/T5,(T2+G23+T3)/T4, (T7+G78+T8)/T1, (G45+T5+T6)/T2, EFL/(G12+T2+T3),ALT/(T1+G34+G56), AAG/(G67+G78), TL/(T3+G34+T6), TTL/(G78+T8+BFL),EFL/(T1+T4+T5), (T3+G34)/T5, (T1+G23)/T4, (T1+AAG)/T3, (G12+G78)/T2,AAG/T8, and (T3+T4+T5)/T8 of the present embodiment.

Reference is now made to FIGS. 14-17. FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 3 according to a thirdexample embodiment. FIG. 15 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 3 according to the third example embodiment. FIG.16 shows an example table of optical data of each lens element of theoptical imaging lens 3 according to the third example embodiment. FIG.13 shows an example table of aspherical data of the optical imaging lens3 according to the third example embodiment.

As shown in FIG. 14, the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the refracting power of the lens elements, and theconvex or concave surface structures, including, the object-sidesurfaces L1A1, L2A1, L3A1, L4A1, L5A1, L6A1, and L7A1, and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L6A2, L7A2, and L8A2 of thepresent embodiment may be generally similar to the optical imaging lens1, but the differences between the optical imaging lens 1 and theoptical imaging lens 3 may include the concave or convex surfacestructures of the image-side surface L5A2 and the object-side surfaceL8A1. Additional differences may include a radius of curvature, athickness, aspherical data, and/or an effective focal length of eachlens element. More specifically, the peripheral region L5A2P of theimage-side surface L5A2 of the fifth lens element L5 may be concave, andthe peripheral region L8A1P of the object-side surface L8A1 of theeighth lens element L8 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 16 for the opticalcharacteristics of each lens element in the optical imaging lens 3 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 15(a), theoffset of the off-axis light relative to the image point may bewithin±0.01 mm. Referring to FIG. 15(b), and the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.01 mm. Referring to FIG. 15(c), the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.03 mm. Referring to FIG. 15(d), the variation of the distortionaberration of the optical imaging lens 3 may be within 1.6%.

As shown in FIG. 15 and FIG. 16, in comparison with the firstembodiment, the field curvature aberration in the sagittal direction,and the distortion aberration in the third embodiment may be smaller.Further, the third embodiment may be easy to be manufactured and havebetter yield.

Please refer to FIG. 54A for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TTF, GFP, BFL, EFL, TTL,TL, ALT, AAG, HFOV, HFOV/TTL, TTL/(T6+G67+T7+G78), (T6+T7)/T5,(T2+G23+T3)/T4, (T7+G78+T8)/T1, (G45+T5+T6)/T2, EFL/(G12+T2+T3),ALT/(T1+G34+G56), AAG/(G67+G78), TL/(T3+G34+T6), TTL/(G78+T8+BFL),EFL/(T1+T4+T5), (T3+G34)/T5, (T1+G23)/T4, (T1+AAG)/T3, (G12+G78)/T2,AAG/T8, and (T3+T4+T5)/T8 of the present embodiment.

Reference is now made to FIGS. 18-21. FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 4 according to a fourthexample embodiment. FIG. 18 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 4 according to the fourth example embodiment. FIG.19 shows an example table of optical data of each lens element of theoptical imaging lens 4 according to the fourth example embodiment. FIG.20 shows an example table of aspherical data of the optical imaging lens4 according to the fourth example embodiment.

As shown in FIG. 18, the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the refracting power of the lens elements, and theconvex or concave surface structures, including, the object-sidesurfaces L1A1, L3A1, L4A1, L5A1, L6A1, L7A1, and L8A1 and the image-sidesurfaces L2A2, L3A2, L4A2, L5A2, L6A2, L7A2, and L8A2 of the presentembodiment may be generally similar to the optical imaging lens 1, butthe differences between the optical imaging lens 1 and the opticalimaging lens 4 may include the concave or convex surface structures ofthe image-side surface L1A2, and the object-side surface L2A1.Additional differences may include a radius of curvature, a thickness,aspherical data, and/or an effective focal length of each lens element.More specifically, the optical axis region L1A2C of the image-sidesurface L1A2 of the first lens element L1 may be concave, and theperipheral region L2A1P of the object-side surface L2A1 of the secondlens element L2 may be concave.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 20 for the opticalcharacteristics of each lens element in the optical imaging lens 4 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 19(a), theoffset of the off-axis light relative to the image point may bewithin±0.01 mm. Referring to FIG. 19(b), and the focus variation withrespect to the three different wavelengths in the whole field may fallwithin ±0.016 mm. Referring to FIG. 19(c), the focus variation withrespect to the three different wavelengths in the whole field may fallwithin 0.02 mm. Referring to FIG. 19(d), the variation of the distortionaberration of the optical imaging lens 4 may be within±8%.

As shown in FIG. 19 and FIG. 20, in comparison with the firstembodiment, the field curvature aberration in the sagittal direction,and the field curvature aberration in the tangential direction in thefourth embodiment may be smaller. Further, the fourth embodiment may beeasy to be manufactured and have better yield.

Please refer to FIG. 54A for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TTF, GFP, BFL, EFL, TTL,TL, ALT, AAG, HFOV, HFOV/TTL, TTL/(T6+G67+T7+G78), (T6+T7)/T5,(T2+G23+T3)/T4, (T7+G78+T8)/T1, (G45+T5+T6)/T2, EFL/(G12+T2+T3),ALT/(T1+G34+G56), AAG/(G67+G78), TL/(T3+G34+T6), TTL/(G78+T8+BFL),EFL/(T1+T4+T5), (T3+G34)/T5, (T1+G23)/T4, (T1+AAG)/T3, (G12+G78)/T2,AAG/T8, and (T3+T4+T5)/T8 of the present embodiment.

Reference is now made to FIGS. 22-25. FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 5 according to a fifthexample embodiment. FIG. 23 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 5 according to the fifth example embodiment. FIG.24 shows an example table of optical data of each lens element of theoptical imaging lens 5 according to the fifth example embodiment. FIG.25 shows an example table of aspherical data of the optical imaging lens5 according to the fifth example embodiment.

As shown in FIG. 22 the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the refracting power of the lens elements, and theconvex or concave surface structures, including, the object-sidesurfaces L1A1, L3A1, L4A1, L5A1, L6A1, and L7A1, and the image-sidesurfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2, L7A2, and L8A2 of thepresent embodiment may be generally similar to the optical imaging lens1, but the differences between the optical imaging lens 1 and theoptical imaging lens 5 may include the concave or convex surfacestructures of the object-side surfaces L2A1, and L8A1. Additionaldifferences may include a radius of curvature, a thickness, asphericaldata, and/or an effective focal length of each lens element. Morespecifically, the peripheral region L2A1P of the object-side surfaceL2A1 of the second lens element L2 may be concave, and the peripheralregion L8A1P of the object-side surface L8A1 of the eighth lens elementL8 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 24 for the opticalcharacteristics of each lens element in the optical imaging lens 5 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 23(a), theoffset of the off-axis light relative to the image point may bewithin±0.008 mm. Referring to FIG. 23(b), and the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.02 mm. Referring to FIG. 23(c), the focus variation withrespect to the three different wavelengths in the whole field may fallwithin 0.03 mm. Referring to FIG. 23(d), the variation of the distortionaberration of the optical imaging lens 5 may be within±4%.

As shown in FIG. 23 and FIG. 24, in comparison with the firstembodiment, the longitudinal spherical aberration in the fifthembodiment may be smaller. Further, the fifth embodiment may be easy tobe manufactured and have better yield.

Please refer to FIG. 54A for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TTF, GFP, BFL, EFL, TTL,TL, ALT, AAG, HFOV, HFOV/TTL, TTL/(T6+G67+T7+G78), (T6+T7)/T5,(T2+G23+T3)/T4, (T7+G78+T8)/T1, (G45+T5+T6)/T2, EFL/(G12+T2+T3),ALT/(T1+G34+G56), AAG/(G67+G78), TL/(T3+G34+T6), TTL/(G78+T8+BFL),EFL/(T1+T4+T5), (T3+G34)/T5, (T1+G23)/T4, (T1+AAG)/T3, (G12+G78)/T2,AAG/T8, and (T3+T4+T5)/T8 of the present embodiment.

Reference is now made to FIGS. 26-29. FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 6 according to a sixthexample embodiment. FIG. 27 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 6 according to the sixth example embodiment. FIG.28 shows an example table of optical data of each lens element of theoptical imaging lens 6 according to the sixth example embodiment. FIG.29 shows an example table of aspherical data of the optical imaging lens6 according to the sixth example embodiment.

As shown in FIG. 26 the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the convex or concave surface structures, including,the object-side surfaces L2A1, L3A1, L4A1, L5A1, L6A1, and L7A1, and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2, L7A2, and L8A2of the present embodiment may be generally similar to the opticalimaging lens 1, but the differences between the optical imaging lens 1and the optical imaging lens 6 may include the refracting power of thefifth lens element L5, and the concave or convex surface structures ofthe object-side surface L1A1, and L8A1. Additional differences mayinclude a radius of curvature, a thickness, aspherical data, and/or aneffective focal length of each lens element. More specifically, thefifth lens element L5 may have negative refracting power, the peripheralregion L1A1P of the object-side surface L1A1 of the first lens elementL1 may be concave, and the peripheral region L8A1P of the object-sidesurface L8A1 of the eighth lens element L8 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 28 for the opticalcharacteristics of each lens element in the optical imaging lens 6 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 27(a), theoffset of the off-axis light relative to the image point may bewithin±0.02 mm. Referring to FIG. 27(b), and the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.02 mm. Referring to FIG. 27(c), the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.04 mm. Referring to FIG. 27(d), the variation of the distortionaberration of the optical imaging lens 6 may be within±12%.

As shown in FIG. 27 and FIG. 28, in comparison with the firstembodiment, the sixth embodiment may be easy to be manufactured and havebetter yield.

Please refer to FIG. 54B for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TTF, GFP, BFL, EFL, TTL,TL, ALT, AAG, HFOV, HFOV/TTL, TTL/(T6+G67+T7+G78), (T6+T7)/T5,(T2+G23+T3)/T4, (T7+G78+T8)/T1, (G45+T5+T6)/T2, EFL/(G12+T2+T3),ALT/(T1+G34+G56), AAG/(G67+G78), TL/(T3+G34+T6), TTL/(G78+T8+BFL),EFL/(T1+T4+T5), (T3+G34)/T5, (T1+G23)/T4, (T1+AAG)/T3, (G12+G78)/T2,AAG/T8, and (T3+T4+T5)/T8 of the present embodiment.

Reference is now made to FIGS. 30-33. FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 7 according to a seventhexample embodiment. FIG. 31 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 7 according to the seventh example embodiment. FIG.32 shows an example table of optical data of each lens element of theoptical imaging lens 7 according to the seventh example embodiment. FIG.33 shows an example table of aspherical data of the optical imaging lens7 according to the seventh example embodiment.

As shown in FIG. 30 the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the convex or concave surface structures, including,the object-side surfaces L3A1, L4A1, L5A1, L6A1, and L7A1, and theimage-side surfaces L3A2, L4A2, L5A2, L6A2, L7A2, and L8A2 of thepresent embodiment may be generally similar to the optical imaging lens1, but the differences between the optical imaging lens 1 and theoptical imaging lens 7 may include the refracting power of the fifthlens element L5, and the concave or convex surface structures of theobject-side surfaces L1A1, L2A1, and L8A1 and image-side surfaces L1A2,L2A2. Additional differences may include a radius of curvature, athickness, aspherical data, and/or an effective focal length of eachlens element. More specifically, the fifth lens element L5 may havenegative refracting power, the peripheral region L1A1P of theobject-side surface L1A1 of the first lens element L1 may be concave,the optical axis region L1A2C of the image-side surface L1A2 of thefirst lens element L1 may be concave, the periphery region L2A1P of theobject-side surface L2A1 of the second lens element L2 may be concave,the periphery region L2A2P of the image-side surface L2A2 of the secondlens element L2 may be convex, and the peripheral region L8A1P of theobject-side surface L8A1 of the eighth lens element L8 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 32 for the opticalcharacteristics of each lens element in the optical imaging lens 7 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 31(a), theoffset of the off-axis light relative to the image point may bewithin±0.008 mm. Referring to FIG. 31(b), and the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.02 mm. Referring to FIG. 31(c), the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.04 mm. Referring to FIG. 31(d), the variation of the distortionaberration of the optical imaging lens 7 may be within±8%.

As shown in FIG. 31 and FIG. 32, in comparison with the firstembodiment, the longitudinal spherical aberration of the seventhembodiment may be smaller. Further, the seventh embodiment may be easyto be manufactured and have better yield.

Please refer to FIG. 54B for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TTF, GFP, BFL, EFL, TTL,TL, ALT, AAG, HFOV, HFOV/TTL, TTL/(T6+G67+T7+G78), (T6+T7)/T5,(T2+G23+T3)/T4, (T7+G78+T8)/T1, (G45+T5+T6)/T2, EFL/(G12+T2+T3),ALT/(T1+G34+G56), AAG/(G67+G78), TL/(T3+G34+T6), TTL/(G78+T8+BFL),EFL/(T1+T4+T5), (T3+G34)/T5, (T1+G23)/T4, (T1+AAG)/T3, (G12+G78)/T2,AAG/T8, and (T3+T4+T5)/T8 of the present embodiment.

Reference is now made to FIGS. 34-37. FIG. 34 illustrates an examplecross-sectional view of an optical imaging lens 8 according to an eighthexample embodiment. FIG. 35 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 8 according to the eighth example embodiment. FIG.36 shows an example table of optical data of each lens element of theoptical imaging lens 8 according to the eighth example embodiment. FIG.37 shows an example table of aspherical data of the optical imaging lens8 according to the eighth example embodiment.

As shown in FIG. 34 the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the convex or concave surface structures, including,the object-side surfaces L2A1, L3A1, L4A1, L5A1, L6A1, and L7A1, and theimage-side surfaces L1A2, L2A2, L3A2, L4A2, L6A2, L7A2, and L8A2 of thepresent embodiment may be generally similar to the optical imaging lens1, but the differences between the optical imaging lens 1 and theoptical imaging lens 8 may include the refracting power of the fifthlens element L5, and the concave or convex surface structures of theobject-side surfaces L1A1, and L8A1 and image-side surfaces L5A2.Additional differences may include a radius of curvature, a thickness,aspherical data, and/or an effective focal length of each lens element.More specifically, the fifth lens element L5 may have negativerefracting power, the peripheral region L1A1P of the object-side surfaceL1A1 of the first lens element L1 and the periphery region L5A2P of theimage-side surface L5A2 of the fifth lent element L5 may be concave, andthe peripheral region L8A1P of the object-side surface L8A1 of theeighth lens element L8 may be convex.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 36 for the opticalcharacteristics of each lens element in the optical imaging lens 8 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 35(a), theoffset of the off-axis light relative to the image point may bewithin±0.005 mm. Referring to FIG. 35(b), and the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.02 mm. Referring to FIG. 35(c), the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.03 mm. Referring to FIG. 35(d), the variation of the distortionaberration of the optical imaging lens 8 may be within±10%.

As shown in FIG. 35 and FIG. 36, in comparison with the firstembodiment, the longitudinal spherical aberration of the eighthembodiment may be smaller, and the system effective focal length of theeighth embodiment may be shorter. Further, the eighth embodiment may beeasy to be manufactured and have better yield.

Please refer to FIG. 54B for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TTF, GFP, BFL, EFL, TTL,TL, ALT, AAG, HFOV, HFOV/TTL, TTL/(T6+G67+T7+G78), (T6+T7)/T5,(T2+G23+T3)/T4, (T7+G78+T8)/T1, (G45+T5+T6)/T2, EFL/(G12+T2+T3),ALT/(T1+G34+G56), AAG/(G67+G78), TL/(T3+G34+T6), TTL/(G78+T8+BFL),EFL/(T1+T4+T5), (T3+G34)/T5, (T1+G23)/T4, (T1+AAG)/T3, (G12+G78)/T2,AAG/T8, and (T3+T4+T5)/T8 of the present embodiment.

Reference is now made to FIGS. 38-41. FIG. 41 illustrates an examplecross-sectional view of an optical imaging lens 9 according to a ninthexample embodiment. FIG. 39 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 9 according to the ninth example embodiment. FIG.40 shows an example table of optical data of each lens element of theoptical imaging lens 9 according to the ninth example embodiment. FIG.41 shows an example table of aspherical data of the optical imaging lens9 according to the ninth example embodiment.

As shown in FIG. 38 the optical imaging lens 9 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the convex or concave surface structures, including,the object-side surfaces L1A1, L3A1, L4A1, L5A1, L6A1, L7A1, and L8A1and the image-side surfaces L3A2, L4A2, L6A2, L7A2, and L8A2 of thepresent embodiment may be generally similar to the optical imaging lens1, but the differences between the optical imaging lens 1 and theoptical imaging lens 9 may include the refracting power of the fifthlens element L5, and the concave or convex surface structures of theobject-side surfaces L2A1, and image-side surfaces L1A2, L2A2, L5A2.Additional differences may include a radius of curvature, a thickness,aspherical data, and/or an effective focal length of each lens element.More specifically, the fifth lens element L5 may have negativerefracting power, the optical axis region L1A2C of the image-sidesurface L1A2 of the first lens element L1 may be concave, the peripheryregion L2A1P of the object-side surface L2A1 of the second lent elementL2 may be concave, the periphery region L2A2P of the image-side surfaceL2A2 of the second lens element L2 may be convex, and the peripheralregion L5A2P of the image-side surface L5A2 of the fifth lens element L5may be concave.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 40 for the opticalcharacteristics of each lens element in the optical imaging lens 9 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 39(a), theoffset of the off-axis light relative to the image point may bewithin±0.012 mm. Referring to FIG. 39(b), and the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.03 mm. Referring to FIG. 39(c), the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.04 mm. Referring to FIG. 39(d), the variation of the distortionaberration of the optical imaging lens 9 may be within±12%.

As shown in FIG. 39 and FIG. 40, in comparison with the firstembodiment, the ninth embodiment may be easy to be manufactured and havebetter yield.

Please refer to FIG. 54B for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TTF, GFP, BFL, EFL, TTL,TL, ALT, AAG, HFOV, HFOV/TTL, TTL/(T6+G67+T7+G78), (T6+T7)/T5,(T2+G23+T3)/T4, (T7+G78+T8)/T1, (G45+T5+T6)/T2, EFL/(G12+T2+T3),ALT/(T1+G34+G56), AAG/(G67+G78), TL/(T3+G34+T6), TTL/(G78+T8+BFL),EFL/(T1+T4+T5), (T3+G34)/T5, (T1+G23)/T4, (T1+AAG)/T3, (G12+G78)/T2,AAG/T8, and (T3+T4+T5)/T8 of the present embodiment.

Reference is now made to FIGS. 42-45. FIG. 42 illustrates an examplecross-sectional view of an optical imaging lens 10 according to a tenthexample embodiment. FIG. 43 shows example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 10 according to the tenth example embodiment. FIG.44 shows an example table of optical data of each lens element of theoptical imaging lens 10 according to the tenth example embodiment. FIG.45 shows an example table of aspherical data of the optical imaging lens10 according to the tenth example embodiment.

As shown in FIG. 42 the optical imaging lens 10 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, and an eighth lens element L8.

The arrangement of the convex or concave surface structures, including,the object-side surfaces L3A1, L4A1, L5A1, L6A1, L7A1, and L8A1 and theimage-side surfaces L1A2, L3A2, L4A2, L5A2, L6A2, and L7A2 of thepresent embodiment may be generally similar to the optical imaging lens1, but the differences between the optical imaging lens 1 and theoptical imaging lens 10 may include the refracting power of the fifthlens element L5, and the concave or convex surface structures of theobject-side surfaces L1A1, L2A1, and image-side surfaces L2A2, L8A2.Additional differences may include a radius of curvature, a thickness,aspherical data, and/or an effective focal length of each lens element.More specifically, the fifth lens element L5 may have negativerefracting power, the peripheral region L1A1P of the object-side surfaceL1A1 of the first lens element L1 may be concave, the periphery regionL2A1P of the object-side surface L2A1 of the second lent element L2 maybe concave, the periphery region L2A2P of the image-side surface L2A2 ofthe second lens element L2 may be convex, and the peripheral regionL8A2P of the image-side surface L8A2 of the eighth lens element L8 maybe concave.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 44 for the opticalcharacteristics of each lens element in the optical imaging lens 10 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 43(a), theoffset of the off-axis light relative to the image point may bewithin±0.01 mm. Referring to FIG. 43(b), and the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.02 mm. Referring to FIG. 43(c), the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.03 mm. Referring to FIG. 43(d), the variation of the distortionaberration of the optical imaging lens 10 may be within±16%.

As shown in FIG. 43 and FIG. 44, in comparison with the firstembodiment, the tenth embodiment may be easy to be manufactured and havebetter yield.

Please refer to FIG. 54B for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TTF, GFP, BFL, EFL, TTL,TL, ALT, AAG, HFOV, HFOV/TTL, TTL/(T6+G67+T7+G78), (T6+T7)/T5,(T2+G23+T3)/T4, (T7+G78+T8)/T1, (G45+T5+T6)/T2, EFL/(G12+T2+T3),ALT/(T1+G34+G56), AAG/(G67+G78), TL/(T3+G34+T6), TTL/(G78+T8+BFL),EFL/(T1+T4+T5), (T3+G34)/T5, (T1+G23)/T4, (T1+AAG)/T3, (G12+G78)/T2,AAG/T8, and (T3+T4+T5)/T8 of the present embodiment.

Reference is now made to FIGS. 46-49. FIG. 46 illustrates an examplecross-sectional view of an optical imaging lens 11 according to aneleventh example embodiment. FIG. 47 shows example charts of alongitudinal spherical aberration and other kinds of optical aberrationsof the optical imaging lens 11 according to the eleventh exampleembodiment. FIG. 48 shows an example table of optical data of each lenselement of the optical imaging lens 11 according to the eleventh exampleembodiment. FIG. 49 shows an example table of aspherical data of theoptical imaging lens 11 according to the eleventh example embodiment.

As shown in FIG. 46 the optical imaging lens 11 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, a ninth lens element L9, and an eighth lens element L8.

Exemplary embodiments of each lens element of the optical imaging lens11 will now be described with reference to the drawings. The lenselements L1, L2, L3, L4, L5, L6, L7, L8, L9 of the optical imaging lens11 may be constructed using plastic materials in this embodiment for thepurpose of lightweight product.

An example embodiment of the first lens element L1 may be arranged to bea lens element in a first order from the object side A1 to the imageside A2 and have positive refracting power. The optical axis regionL1A1C of the object-side surface L1A1 of the first lens element L1 maybe convex. The periphery region L1A1P of the object-side surface L1A1 ofthe first lens element L1 may be concave. The optical axis region L1A2Cand the periphery region L1A2P of the image-side surface L1A2 of thefirst lens element L1 may be convex.

An example embodiment of the second lens element L2 may be arranged to alens element in a second order from the object side A1 to the image sideA2 and have negative refracting power. The optical axis region L2A1C ofthe object-side surface L2A1 of the second lens element L2 may beconvex. The periphery region L2A1P of the object-side surface L2A1 ofthe second lens element L2 may be concave. The optical axis region L2A2Cand the periphery region L2A2P of the image-side surface L2A2 of thesecond lens element L2 may be concave.

An example embodiment of the third lens element L3 may be arranged to alens element in a third order from the object side A1 to the image sideA2 and have positive refracting power. The optical axis region L3A1C ofthe object-side surface L3A1 of the third lens element L3 may be convex.The periphery region L3A1P of the object-side surface L3A1 of the thirdlens element L3 may be concave. The optical axis region L3A2C and theperiphery region L3A2P of the image-side surface L3A2 of the third lenselement L3 may be convex.

An example embodiment of the fourth lens element L4 may be arranged tobe a lens element in a fourth order from the object side A1 to the imageside A2 and have negative refracting power. The optical axis regionL4A1C and the periphery region L4A1P of the object-side surface L4A1 ofthe fourth lens element L4 may be concave. The optical axis region L4A2Cand the periphery region L4A2P of the image-side surface L4A2 of thefourth lens element L4 may be convex.

An example embodiment of the fifth lens element L5 may be arranged to bea lens element in a fifth order from the object side A1 to the imageside A2 and have negative refracting power. The optical axis regionL5A1C and the periphery region L5A1P of the object-side surface L5A1 ofthe fifth lens element L5 may be concave. The optical axis region L5A2Cand the periphery region L5A2P of the image-side surface L5A2 of thefifth lens element L5 may be convex.

An example embodiment of the sixth lens element L6 may be arranged to bea lens element in a sixth order from the object side A1 to the imageside A2 and have positive refracting power. The optical axis regionL6A1C of the object-side surface L6A1 of the sixth lens element L6 maybe convex. The periphery region L6A1P of the object-side surface L6A1 ofthe sixth lens element L6 may be concave. The optical axis region L6A2Cand the periphery region L6A2P of the image-side surface L6A2 of thesixth lens element L6 may be convex.

An example embodiment of the seventh lens element L7 may be arranged tobe a lens element in a seventh order from the object side A1 to theimage side A2 and may have negative refracting power. The optical axisregion L7A1C of the object-side surface L7A1 of the seventh lens elementL7 may be convex. The periphery region L7A1P of the object-side surfaceL7A1 of the seventh lens element L7 may be concave. The optical axisregion L7A2C of the seventh lens element L7 may be concave. Theperiphery region L7A2P of the image-side surface L7A2 of the seventhlens element L7 may be convex.

An example embodiment of the eighth lens element L8 may be arranged tobe a lens element in a first order from the image side A2 to the objectside A1 and have negative refracting power. The optical axis regionL8A1C of the object-side surface L8A1 of the eighth lens element L8 maybe concave. The periphery region L8A1P of the object-side surface L8A1of the eighth lens element L8 may be convex. The optical axis regionL8A2C of the image-side surface L8A2 of the eight lens element L8 may beconcave. The periphery region L8A2P of the image-side surface L8A2 ofthe eighth lens element L8 may be convex.

An example embodiment of the ninth lens element L9 may be arrangedbetween the seventh lens element L7 and the eighth lens element L8, andhave negative refracting power. The optical axis region L9A1C and theperiphery region L9A1P of the object-side surface L9A1 of the ninth lenselement L9 may be concave. The optical axis region L9A2C of theimage-side surface L9A2 of the ninth lens element L9 may be concave. Theperiphery region L9A2P of the image-side surface L9A2 of the ninth lenselement L9 may be convex.

The totaled 18 aspherical surfaces including the object-side surfaceL1A1 and the image-side surface L1A2 of the first lens element L1, theobject-side surface L2A1 and the image-side surface L2A2 of the secondlens element L2, the object-side surface L3A1 and the image-side surfaceL3A2 of the third lens element L3, the object-side surface L4A1 and theimage-side surface L4A2 of the fourth lens element L4, the object-sidesurface L5A1 and the image-side surface L5A2 of the fifth lens elementL5, the object-side surface L6A1 and the image-side surface L6A2 of thesixth lens element L6, the object-side surface L7A1 and the image-sidesurface L7A2 of the seventh lens element L7, the object-side surfaceL9A1 and the image-side surface L9A2 of the ninth lens element L9, andthe object-side surface L8A1 and the image-side surface L8A2 of theeighth lens element L8 may all be defined by the above asphericalformula (1).

The values of each aspherical parameter are shown in FIG. 49.

From the vertical deviation of each curve shown in FIG. 47(a), theoffset of the off-axis light relative to the image point may bewithin±0.009 mm. Referring to FIG. 47(b), and the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.02 mm. Referring to FIG. 47(c), the focus variation withrespect to the three different wavelengths in the whole field may fallwithin±0.03 mm. Referring to FIG. 47(d), the variation of the distortionaberration of the optical imaging lens 11 may be within±4%.

As shown in FIG. 48, TTL may be 3.562 mm, Fno may be 2.000, HFOV may be45.200 degrees, EFL may be 2.369 mm, and ImgH may be 2.082 mm. Inconjunction with values of aberrations in FIG. 47, the presentembodiment may provide an optical imaging lens 11 having a shortenedlength and an extended field of view while improving opticalperformance.

Please refer to FIG. 54B for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TTF, GFP, BFL, EFL, TTL,TL, ALT, AAG, HFOV, HFOV/TTL, TTL/(T6+G67+T7+G78), (T6+T7)/T5,(T2+G23+T3)/T4, (T7+G78+T8)/T1, (G45+T5+T6)/T2, EFL/(G12+T2+T3),ALT/(T1+G34+G56), AAG/(G67+G78), TL/(T3+G34+T6), TTL/(G78+T8+BFL),EFL/(T1+T4+T5), (T3+G34)/T5, (T1+G23)/T4, (T1+AAG)/T3, (G12+G78)/T2,AAG/T8, and (T3+T4+T5)/T8 of the present embodiment.

Reference is now made to FIGS. 50-53. FIG. 50 illustrates an examplecross-sectional view of an optical imaging lens 12 according to atwelfth example embodiment. FIG. 51 shows example charts of alongitudinal spherical aberration and other kinds of optical aberrationsof the optical imaging lens 12 according to the twelfth exampleembodiment. FIG. 52 shows an example table of optical data of each lenselement of the optical imaging lens 12 according to the twelfth exampleembodiment. FIG. 53 shows an example table of aspherical data of theoptical imaging lens 12 according to the twelfth example embodiment.

As shown in FIG. 50 the optical imaging lens 12 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7, a ninth lens element L9, and an eighth lens element L8.

The arrangement of the convex or concave surface structures, including,the object-side surfaces L3A1, L4A1, L5A1, L6A1, L7A1, and L9A1 and theimage-side surfaces L2A2, L3A2, L4A2, L5A2, L6A2, L7A2, L9A2, and L8A2of the present embodiment may be generally similar to the opticalimaging lens 11, but the differences between the optical imaging lens 11and the optical imaging lens 12 may include the refracting power of thefifth lens element L5, and the concave or convex surface structures ofthe object-side surfaces L1A1, L2A1, L8A1 and image-side surface L1A2.Additional differences may include a radius of curvature, a thickness,aspherical data, and/or an effective focal length of each lens element.More specifically, the fifth lens element L5 may have positiverefracting power, the peripheral region L1A1P of the object-side surfaceL1A1 of the first lens element L1 may be convex, the optical axis regionL1A2C of the image-side surface L1A2 of the first lens element may beconcave, the periphery region L2A1P of the object-side surface L2A1 ofthe second lent element L2 may be convex, and the peripheral regionL8A1P of the object-side surface L8A1 of the eighth lens element L8 maybe concave.

Here, in the interest of clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Please refer to FIG. 52 for the opticalcharacteristics of each lens element in the optical imaging lens 12 ofthe present embodiment.

From the vertical deviation of each curve shown in FIG. 51(a), theoffset of the off-axis light relative to the image point may bewithin±0.008 mm. Referring to FIG. 51(b), and the focus variation withrespect to the three different wavelengths in the whole field may fallwithin 0.016 mm. Referring to FIG. 51(c), the focus variation withrespect to the three different wavelengths in the whole field may fallwithin 0.016 mm. Referring to FIG. 51(d), the variation of thedistortion aberration of the optical imaging lens 12 may be within 16%.

As shown in FIG. 51 and FIG. 52, in comparison with the eleventhembodiment, the longitudinal spherical aberration, the field curvatureaberration in the sagittal direction, and the field curvature aberrationin the tangential direction of the twelfth embodiment may be smaller,and the system length may be shorter.

Please refer to FIG. 54B for the values of T1, G12, T2, G23, T3, G34,T4, G45, T5, G56, T6, G67, T7, G78, T8, G8F, TTF, GFP, BFL, EFL, TTL,TL, ALT, AAG, HFOV, HFOV/TTL, TTL/(T6+G67+T7+G78), (T6+T7)/T5,(T2+G23+T3)/T4, (T7+G78+T8)/T1, (G45+T5+T6)/T2, EFL/(G12+T2+T3),ALT/(T1+G34+G56), AAG/(G67+G78), TL/(T3+G34+T6), TTL/(G78+T8+BFL),EFL/(T1+T4+T5), (T3+G34)/T5, (T1+G23)/T4, (T1+AAG)/T3, (G12+G78)/T2,AAG/T8, and (T3+T4+T5)/T8 of the present embodiment.

The optical imaging lens in each embodiment of the present disclosurewith the arrangements of the convex or concave surface structuresdescribed below may advantageously increase the field of view: thesecond lens element having negative refracting power, the fourth lenselement having negative refracting power, an optical axis region of theobject-side surface the fourth lens element being concave, the seventhlens element having negative refracting power, an optical axis region ofthe object-side surface of the eighth lens element being concave, andthe optical imaging lens satisfying the inequality (1):HFOV/TTL≥8.500°/mm; alternatively, the fourth lens element havingnegative refracting power, an optical axis region of the object-sidesurface the fourth lens element being concave, a periphery region of theobject-side surface of the fifth lens element being concave, the seventhlens element having negative refracting power, an optical axis region ofthe object-side surface of the eighth lens element being concave, andthe optical imaging lens satisfying the inequality (1):HFOV/TTL≥8.500°/mm; alternatively, a periphery region of the image-sidesurface of the first lens element being convex, the seventh lens elementhaving negative refracting power, an optical axis region of theobject-side surface of the eighth lens element being concave, and theoptical imaging lens satisfying the inequality (1): HFOV/TTL≥8.500°/mm.This may advantageously adjust longitudinal spherical aberrations andfield curvature aberration, and reduce the distortion aberration.

According to above disclosure, the longitudinal spherical aberration,the field curvature aberration and the variation of the distortionaberration of each embodiment may meet the use requirements of variouselectronic products which implement an optical imaging lens. Moreover,the off-axis light with respect to 470 nm, 555 nm and 650 nm wavelengthsmay be focused around an image point, and the offset of the off-axislight for each curve relative to the image point may be controlled toeffectively inhibit the longitudinal spherical aberration, the fieldcurvature aberration and/or the variation of the distortion aberration.Further, as shown by the imaging quality data provided for eachembodiment, the distance between the 470 nm, 555 nm and 650 nmwavelengths may indicate that focusing ability and inhibiting abilityfor dispersion may be provided for different wavelengths.

In consideration of the non-predictability of the optical lens assembly,while the optical lens assembly may satisfy any one of inequalitiesdescribed above, the optical lens assembly herein according to thedisclosure may achieve a shortened length and smaller sphericalaberration, field curvature aberration, and/or distortion aberration,provide an enlarged field of view, increase an imaging quality and/orassembly yield, and/or effectively improve drawbacks of a typicaloptical lens assembly.

While various embodiments in accordance with the disclosed principlesare described above, it should be understood that they are presented byway of example only, and are not limiting. Thus, the breadth and scopeof exemplary embodiment(s) should not be limited by any of theabove-described embodiments, but should be defined only in accordancewith the claims and their equivalents issuing from this disclosure.Furthermore, the above advantages and features are provided in describedembodiments, but shall not limit the application of such issued claimsto processes and structures accomplishing any or all of the aboveadvantages.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens comprising a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement and an eighth lens element sequentially from an object side toan image side along an optical axis, each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens elements having anobject-side surface facing toward the object side and allowing imagingrays to pass through as well as an image-side surface facing toward theimage side and allowing the imaging rays to pass through, wherein: thefirst lens element is arranged to be a lens element in a first orderfrom the object side to the image side; the second lens element isarranged to be a lens element in a second order from the object side tothe image side and has negative refracting power; the third lens elementis arranged to be a lens element in a third order from the object sideto the image side; the fourth lens element is arranged to be a lenselement in a fourth order from the object side to the image side and hasnegative refracting power; an optical axis region of the object-sidesurface of the fourth lens element is concave; the fifth lens element isarranged to be a lens element in a fifth order from the object side tothe image side; the sixth lens element is arranged to be a lens elementin a sixth order from the object side to the image side; the seventhlens element is arranged to be a lens element in a seventh order fromthe object side to the image side and has negative refracting power; theeighth lens element is arranged to be a lens element in a first orderfrom the image side to the object side; an optical axis region of theobject-side surface of the eighth lens element is concave; a half fieldof view of the optical imaging lens is represented by HFOV; a distancefrom the object-side surface of the first lens element to an image planealong the optical axis is represented by TTL; and the optical imaginglens satisfies an inequality: HFOV/TTL≥8.500°/mm.
 2. The optical imaginglens according to claim 1, wherein a thickness of the sixth lens elementalong the optical axis is represented by T6, a thickness of the seventhlens element along the optical axis is represented by T7, a distancefrom the image-side surface of the sixth lens element to the object-sidesurface of the seventh lens element along the optical axis isrepresented by G67, a distance from the image-side surface of theseventh lens element to the object-side surface of the eighth lenselement along the optical axis is represented by G78, and the opticalimaging lens further satisfies an inequality: TTL/(T6+G67+T7+G78)≤4.500.3. The optical imaging lens according to claim 1, wherein a thickness ofthe fifth lens element along the optical axis is represented by T5, athickness of the sixth lens element along the optical axis isrepresented by T6, a thickness of the seventh lens element along theoptical axis is represented by T7, and the optical imaging lens furthersatisfies an inequality: (T6+T7)/T5≤3.600.
 4. The optical imaging lensaccording to claim 1, wherein a thickness of the second lens elementalong the optical axis is represented by T2, a thickness of the thirdlens element along the optical axis is represented by T3, a thickness ofthe fourth lens element along the optical axis is represented by T4, adistance from the image-side surface of the second lens element to theobject-side surface of the third lens element along the optical axis isrepresented by G23, and the optical imaging lens further satisfies aninequality: (T2+G23+T3)/T4≤4.200.
 5. The optical imaging lens accordingto claim 1, wherein a thickness of the first lens element along theoptical axis is represented by T1, a thickness of the seventh lenselement along the optical axis is represented by T7, a thickness of theeighth lens element along the optical axis is represented by T8, adistance from the image-side surface of the seventh lens element to theobject-side surface of the eighth lens element along the optical axis isrepresented by G78, and the optical imaging lens further satisfies aninequality: (T7+G78+T8)/T1≤3.500.
 6. The optical imaging lens accordingto claim 1, wherein a thickness of the second lens element along theoptical axis is represented by T2, a thickness of the fifth lens elementalong the optical axis is represented by T5, a thickness of the sixthlens element along the optical axis is represented by T6, a distancefrom the image-side surface of the fourth lens element to theobject-side surface of the fifth lens element along the optical axis isrepresented by G45, and the optical imaging lens further satisfies aninequality: (G45+T5+T6)/T2≤5.300.
 7. The optical imaging lens accordingto claim 1, wherein a thickness of the second lens element along theoptical axis is represented by T2, a thickness of the third lens elementalong the optical axis is represented by T3, a distance from theimage-side surface of the first lens element to the object-side surfaceof the second lens element along the optical axis is represented by G12,an effective focal length of the optical imaging lens is represented byEFL, and the optical imaging lens further satisfies an inequality:EFL/(G12+T2+T3)≤4.700.
 8. An optical imaging lens comprising a firstlens element, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement and an eighth lens element sequentially from an object side toan image side along an optical axis, each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens elements having anobject-side surface facing toward the object side and allowing imagingrays to pass through as well as an image-side surface facing toward theimage side and allowing the imaging rays to pass through, wherein: thefirst lens element is arranged to be a lens element in a first orderfrom the object side to the image side; the second lens element isarranged to be a lens element in a second order from the object side tothe image side; the third lens element is arranged to be a lens elementin a third order from the object side to the image side; the fourth lenselement is arranged to be a lens element in a fourth order from theobject side to the image side and has negative refracting power; anoptical axis region of the object-side surface of the fourth lenselement is concave; the fifth lens element is arranged to be a lenselement in a fifth order from the object side to the image side; aperiphery region of the object-side surface of the fifth lens element isconcave; the sixth lens element is arranged to be a lens element in asixth order from the object side to the image side; the seventh lenselement is arranged to be a lens element in a seventh order from theobject side to the image side and has negative refracting power; theeighth lens element is arranged to be a lens element in a first orderfrom the image side to the object side; an optical axis region of theobject-side surface of the eighth lens element is concave; a half fieldof view of the optical imaging lens is represented by HFOV; a distancefrom the object-side surface of the first lens element to an image planealong the optical axis is represented by TTL; and the optical imaginglens satisfies an inequality: HFOV/TTL≥8.500°/mm.
 9. The optical imaginglens according to claim 8, wherein a thickness of the first lens elementalong the optical axis is represented by T1, a distance from theimage-side surface of the third lens element to the object-side surfaceof the fourth lens element along the optical axis is represented by G34,a distance from the image-side surface of the fifth lens element to theobject-side surface of the sixth lens element along the optical axis isrepresented by G56, a sum of the thicknesses of the first lens element,the second lens element, the third lens element, the fourth lenselement, the fifth lens element, the sixth lens element, the seventhlens element, and the eighth lens element along the optical axis isrepresented by ALT, and the optical imaging lens further satisfies aninequality: ALT/(T1+G34+G56)≥3.200.
 10. The optical imaging lensaccording to claim 8, wherein a sum of a distance from the image-sidesurface of the first lens element to the object-side surface of thesecond lens element along the optical axis, a distance from theimage-side surface of the second lens element to the object-side surfaceof the third lens element along the optical axis, a distance from theimage-side surface of the third lens element to the object-side surfaceof the fourth lens element along the optical axis, a distance from theimage-side surface of the fourth lens element to the object-side surfaceof the fifth lens element along the optical axis, a distance from theimage-side surface of the fifth lens element to the object-side surfaceof the sixth lens element along the optical axis, a distance from theimage-side surface of the sixth lens element to the object-side surfaceof the seventh lens element along the optical axis, and a distance fromthe image-side surface of the seventh lens element to the object-sidesurface of the eighth lens element along the optical axis is representedby AAG, a distance from the image-side surface of the sixth lens elementto the object-side surface of the seventh lens element along the opticalaxis is represented by G67, a distance from the image-side surface ofthe seventh lens element to the object-side surface of the eighth lenselement along the optical axis is represented by G78, and the opticalimaging lens further satisfies an inequality: AAG/(G67+G78)≤3.700. 11.The optical imaging lens according to claim 8, wherein a distance fromthe object-side surface of the first lens element to the image-sidesurface of the eighth lens element along the optical axis is representedby TL, a thickness of the third lens element along the optical axis isrepresented by T3, a thickness of the sixth lens element along theoptical axis is represented by T6, a distance from the image-sidesurface of the third lens element to the object-side surface of thefourth lens element along the optical axis is represented by G34, andthe optical imaging lens further satisfies an inequality:TL/(T3+G34+T6)≤3.600.
 12. The optical imaging lens according to claim 8,wherein a thickness of the eighth lens element along the optical axis isrepresented by T8, a distance from the image-side surface of the seventhlens element to the object-side surface of the eighth lens element alongthe optical axis is represented by G78, a distance from the image-sidesurface of the eighth lens element to the image plane along the opticalaxis is represented by BFL, and the optical imaging lens furthersatisfies an inequality: TTL/(G78+T8+BFL)≤3.800.
 13. The optical imaginglens according to claim 8, wherein a thickness of the first lens elementalong the optical axis is represented by T1, a thickness of the fourthlens element along the optical axis is represented by T4, a thickness ofthe fifth lens element along the optical axis is represented by T5, aneffective focal length of the optical imaging lens is represented byEFL, and the optical imaging lens further satisfies an inequality:EFL/(T1+T4+T5)≤3.600.
 14. The optical imaging lens according to claim 8,wherein a thickness of the third lens element along the optical axis isrepresented by T3, a distance from the image-side surface of the thirdlens element to the object-side surface of the fourth lens element alongthe optical axis is represented by G34, a thickness of the fifth lenselement along the optical axis is represented by T5, and the opticalimaging lens further satisfies an inequality: (T3+G34)/T5≤2.600.
 15. Anoptical imaging lens comprising a first lens element, a second lenselement, a third lens element, a fourth lens element, a fifth lenselement, a sixth lens element, a seventh lens element and an eighth lenselement sequentially from an object side to an image side along anoptical axis, each of the first, second, third, fourth, fifth, sixth,seventh and eighth lens elements having an object-side surface facingtoward the object side and allowing imaging rays to pass through as wellas an image-side surface facing toward the image side and allowing theimaging rays to pass through, wherein: the first lens element isarranged to be a lens element in a first order from the object side tothe image side; a periphery region of the image-side surface of thefirst lens element is convex; the second lens element is arranged to bea lens element in a second order from the object side to the image side;the third lens element is arranged to be a lens element in a third orderfrom the object side to the image side; the fourth lens element isarranged to be a lens element in a fourth order from the object side tothe image side; the fifth lens element is arranged to be a lens elementin a fifth order from the object side to the image side; the sixth lenselement is arranged to be a lens element in a sixth order from theobject side to the image side; the seventh lens element is arranged tobe a lens element in a seventh order from the object side to the imageside and has negative refracting power; the eighth lens element isarranged to be a lens element in a first order from the image side tothe object side; an optical axis region of the object-side surface ofthe eighth lens element is concave; a half field of view of the opticalimaging lens is represented by HFOV; a distance from the object-sidesurface of the first lens element to an image plane along the opticalaxis is represented by TTL; and the optical imaging lens satisfies aninequality: HFOV/TTL≥8.500°/mm.
 16. The optical imaging lens accordingto claim 15, wherein a thickness of the first lens element along theoptical axis is represented by T1, a thickness of the fourth lenselement along the optical axis is represented by T4, a distance from theimage-side surface of the second lens element to the object-side surfaceof the third lens element along the optical axis is represented by G23,and the optical imaging lens further satisfies an inequality:(T1+G23)/T4≤4.300.
 17. The optical imaging lens according to claim 15,wherein a thickness of the first lens element along the optical axis isrepresented by T1, a thickness of the third lens element along theoptical axis is represented by T3, a sum of a distance from theimage-side surface of the first lens element to the object-side surfaceof the second lens element along the optical axis, a distance from theimage-side surface of the second lens element to the object-side surfaceof the third lens element along the optical axis, a distance from theimage-side surface of the third lens element to the object-side surfaceof the fourth lens element along the optical axis, a distance from theimage-side surface of the fourth lens element to the object-side surfaceof the fifth lens element along the optical axis, a distance from theimage-side surface of the fifth lens element to the object-side surfaceof the sixth lens element along the optical axis, a distance from theimage-side surface of the sixth lens element to the object-side surfaceof the seventh lens element along the optical axis, and a distance fromthe image-side surface of the seventh lens element to the object-sidesurface of the eighth lens element along the optical axis is representedby AAG, and the optical imaging lens further satisfies an inequality:(T1+AAG)/T3≤3.800.
 18. The optical imaging lens according to claim 15,wherein a thickness of the second lens element along the optical axis isrepresented by T2, a distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis is represented by G12, a distance from the image-sidesurface of the seventh lens element to the object-side surface of theeighth lens element along the optical axis is represented by G78, andthe optical imaging lens further satisfies an inequality:(G12+G78)/T2≤2.900.
 19. The optical imaging lens according to claim 15,wherein a thickness of the eighth lens element along the optical axis isrepresented by T8, a sum of a distance from the image-side surface ofthe first lens element to the object-side surface of the second lenselement along the optical axis, a distance from the image-side surfaceof the second lens element to the object-side surface of the third lenselement along the optical axis, a distance from the image-side surfaceof the third lens element to the object-side surface of the fourth lenselement along the optical axis, a distance from the image-side surfaceof the fourth lens element to the object-side surface of the fifth lenselement along the optical axis, a distance from the image-side surfaceof the fifth lens element to the object-side surface of the sixth lenselement along the optical axis, a distance from the image-side surfaceof the sixth lens element to the object-side surface of the seventh lenselement along the optical axis, and a distance from the image-sidesurface of the seventh lens element to the object-side surface of theeighth lens element along the optical axis is represented by AAG, andthe optical imaging lens further satisfies an inequality: AAG/T8≤6.600.20. The optical imaging lens according to claim 15, wherein a thicknessof the third lens element along the optical axis is represented by T3, athickness of the fourth lens element along the optical axis isrepresented by T4, a thickness of the fifth lens element along theoptical axis is represented by T5, a thickness of the eighth lenselement along the optical axis is represented by T8, and the opticalimaging lens further satisfies an inequality: (T3+T4+T5)/T8≤3.600.